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The image formed by the lens is erect an...

The image formed by the lens is erect and its length is three times the length of an object. If the focal length of the lens is 15 cm, what kind of lens it is ? Calculate the object and image distance.

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PUNJAB BOARD PREVIOUS YEAR PAPERS-Refraction of Light and Lenses-EXERCISE
  1. A needle placed 45cm from a lens forms an image on the screen placed 9...

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  2. A lens of focal length 12 cm produces a virtual image. The size of ima...

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  3. The image formed by the lens is erect and its length is three times th...

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  4. A lens placed at a distance of 20 cm from an object produces a virtual...

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  5. A needle placed 40 cm from a lens forms an image on a screen placed 80...

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  6. What is the focal lengthof the combination of a convex lens of focal l...

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  7. An object of size 5 cm is placed at distance of 25 cm in front of a co...

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  8. An object of size 10 cm is placed at distance of 20 cm in front of aco...

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  9. Two lenses of powers+15D and -5D are in contact with each other. What ...

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  10. If the focal length of a converging lens is 50 cm. What is the power o...

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  11. Define refractive index?

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  12. State Snell's law of refraction of light.

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  13. What is refraction of light?

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  14. A convex lens made of a material of refractive index mu1 , is kept in ...

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  15. A convex lens made of a material of refractive index 'mu1' is kept in ...

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  16. A convex lens made of a material of refractive index mu1 is kept ih a...

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  17. Define critical angle for total internal reflection.

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  18. Define critical angle for total internal reflection.

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  19. State Snell's law of refraction of light.

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  20. Name the type of lens whichalways produces virtual and erect image.

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